861241541 has 2 divisors, whose sum is σ = 861241542. Its totient is φ = 861241540.

The previous prime is 861241439. The next prime is 861241547. The reversal of 861241541 is 145142168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 757405441 + 103836100 = 27521^2 + 10190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861241541 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 861241498 and 861241507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861241547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430620770 + 430620771.

It is an arithmetic number, because the mean of its divisors is an integer number (430620771).

Almost surely, 2^861241541 is an apocalyptic number.

It is an amenable number.

861241541 is a deficient number, since it is larger than the sum of its proper divisors (1).

861241541 is an equidigital number, since it uses as much as digits as its factorization.

861241541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 32.

The square root of 861241541 is about 29346.9170612519. The cubic root of 861241541 is about 951.4259439150.

The spelling of 861241541 in words is "eight hundred sixty-one million, two hundred forty-one thousand, five hundred forty-one".